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Tagged Image File Format  |  1991-12-11  |  22.4 KB  |  1912x1762  |  1-bit (1 colors)
   ocr: Connector reference 21 21 121 21 Seized af=0 bf=0 prior to ab=1 bb 1 ariswer Answer Fault bb=1 ah-0 Clear forward bb-0 lab=0,1) 29 3 Clear 23 Answer forward Fault af. - 1 unanswered bf 0 31,11 31 11 ab=1 ab=0 Clear bb=1 bb=1 forward 21 21 Answer 31 31 CCITT-60920 System R2 line signalling: conversion of incoming analogue version to outgoing digital version (Shect 2 of3)